Skiving-machine.



H. A. BROWN.

SKU/ING MACHINE. APPLICATION FILED IAN. 5. 1914.

"l 1 39,4809` Patented May 18, 1915.

4 sIIEETsI-SIIEIT 2. w

"Hi/x. BROWN.

SKIVING MACHINE.

APPLICATION FILED 4AN4 5, 1914. I 'a Patented May 1b, 1910..

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/M 'M A H. A. BROWN.

- I SKIIIIIIG MACHINE'. APPLICATION FILED IAN. 5. 1914.l

- I SHEETS-'SHEET 4.

Patente@ May18,1915.

4UNITED STATES PATENT Y HAROLD A; BROWN, OF BROCKTON, MASSACHUSETTS, ASSIGNOR OF 0`NEHALT:` T

BURDETT'AND ONIl-HALF4 TO ARTHUR B. ALBEN, BOTH 0F BROCKTON, 'Mcw' cHUsETTs.

SKIVING-MACHINE.

varied; andt'urtlier to provide various' iinprovenicnts in the cutter driving and work feeding mechanism, and means for making adjustments by which greater accuracy in operation may be secured than has been obtained hitherto, and such accuracy may be maintained underall conditions. Theaneans by which these, objects are secured and inv which the essentials of my invention reside are fully explained in thc following specifit-ation. ln such specification and in the drawings forming a part of the saine l have' illustrated the preferred embodiment ot means for carrying the objects of my invention into effect, without thereby intending` to limit my invention in all respects and in all of the appended claims` to the exact partieula'rs oi c nstruction and arrangement shown and described.

f, 'ln the drawings, Figure 1 is a plan view of a machine containing the preferred einbodiinents ot' the various features of my invention. Fig. 2 is a plan view ot' the mechanism of the machine, represented as though the top of the inclosing case had been removed.' Fig. 3 is a front end elevation of the machine. Fig. 4 is a side elevation of the nrachine. Fig. 5 is a longitudinal section. Fig. (3 is a'cross'section and elevation looking forwardly from. the line (S-G of Fig. 5. Fig. 7 is a detail plan View' of 'the grinder. Fig'. 8 is an under vplan View of the machine showing theV fiiont plate of the case in section. Fig. 9 is a front' elevation of the machineY with the front plate removed. Fig. 10 is a' rear elevationof the machine. Fie'. l1 is a detail elevationv ofthe cutter,4 feed roll, and gaging means. Fig. 12 is a cross section and elevation of the parts on the line 12-12 of Fig. Fig'. 13 ,isa planand lioii- Specification of Letters atciit.

Application tiled January 5, 1914.

Patented May 18, MM5.

semi No. 810,294.

zoiital section ot' the i'eed roll and the iiieeha- 55 iiisui l'or i'lriving it. Fig. li is a liront elevation o'lfuthc Vi'eed roll and associated parts. Fig. l5 is a view similar to Fig. l1 showing a dillcrent adjustment ot' the gaging'iiieans.

Fig. 1G is a sectional view ot a detail ot' the 60 gage adjusting means taken on line lik-16 of Fig. 15. y

The sanie reference characters used in the following,r description refer to the saine parts in all the figures to which such characters are a iplied.

Reterriiig to the drawings 1 represents a casing or box which forms at once the 'frame for supporting the moving parts of the niacliine and in the inclosing case which pro-'70 tects such parts and guards theoperator of the machine from injury. Such case is adapted vto be secured to'a bench or table and has perforated lugs 2 adapted to receive screws or bolts for that purpose. The .75

vase which I have shown here has integral side walls 3, rshoivn in section in Fig. 2, a rear wall 5, aninterinediate transverse'web 6 and a top plate 7 (Fig. 5). These parts are all preferably foi-ined as a single integral casting, and the part 7 is that portion of the top ot' the casing in front yof 'the transverse web 6. rlhe rear portion of the' 'case is covered by a cover plate 8 nnitedby a hinge 9 to the upper edge of the rear Wall 85 and adapted to be swung back to uncover the operating elements in that part of the case. The front of the case is closed by a front wall or doei' 10 united by a hinge 1l to the side Wall 3 and adapted to be swung 90 aside to give access to the knifegrinder and other parts in the forward part of the case. The door is formed with an opening which permits escape of the chips produced by operation of the knife, it protects the operator against vdanger of being cnt by th knife.A A latch i2 assists in holding the Hoor closed. 'The 'web 6 is provided to stitfen the case and provide a 4support for certain of the operating parts, i0

as' will be presently described.

The machine here illustrated is .ot the type using a cylindrical knife, `s311311knife being ar hollowcylinder andhaviiga cutting edge formed at one end. The knife is designated 13 and is best shown in Fig. 5. lt is connected with or formed with a plate 14, constituting in eiltect a part of the knife strucv'vhile at the .saine time 95 ture, which is secured detaohably by screws 15, or their equivalent, to a disk 16 mounted upon a shaft 17.y Said shaft passes throughl a bearing bushing 18 contained in a lug 19 which' hangs down from the Ytop plate 7.- The shaft is further supported and aliJled by a bearing 20 in the transverse web 6 and by a bushing 21 in a' sleeve 22 formed in the rear wall of the case. The shaft carries a -collar 23 fixed upon it at one end of the bushing 21 and a nut 24 threaded to it at the other end of the bushing, and the bushing itself is adapted to be moved endwise in the .sleeve 22 so as to adjust the knife by moving the shaft endwise. For the purpose of making such adjustments I provide a nut 25 set into a transverse slot in the sleeve 22 and engaged with external screw threads on the bushing 21.4 The latter is prevented from rotating by any suitable means, such as akey or screw 26 mounted in the sleeve 22 and entering a longitudinal slot in the bushing. The purpose ofthis adjustment is to maintain the ledge ofthe knife in the proper 25` position even after a large amount of the substance of the knife has been removed by grinding. By reference to Fig. 5 it will be seen that almost the entire length of the 1mm .r'om its edge to the plate 14 may be gradually removed by. grinding before the knife becomes useless. The extent of adjustment permitted by the bushing 21 is enough to bring the edge of the knife into its oper-` ating position as long as enough material of the knife remains to be useful. Power to drive the knife is furnished byl a pulley'27 loosely mounted on a transverse shaft 28 in the rear part of the case and adapted to be rotated by a belt from any suitable source of power. to the shaft by a clutch 29 of suitable char-` acter. In the present illustrated form of the invention the clutch is a disk keyed to they shaft and made operative or'inoperative by" cam levers 30 pivoted on a collar' 31'and operated bya cone 32 lin a well known manner. The cone is engaged `with a lever,33

pivoted at 34 at a fixed point andconnected by a link 35 with a bell crank 36, which is 5o pivoted yto the outside of one of the walls of the case and is adapted to be connected .to a treadle or other suitable device for actuation by the operator: -i The shaft 28 carries a spiral gear37 fixed upon it and meshing with. a conjugate spiral gear 38 splined upon the shaft 17, whereby said shaft and the cutter are positively rotated whenever the'- shaft 28 isdriven.' The splined connection f between the shaft-17 and gear 38 permits the above described longitudinal adjustment of the shaft 17 without displacingv the gear. The latter is held in position by a bracket 39 fixed to the transverse web 6 and suri rounding a sleeve 40 with 1which the gear l si 38 is connected or of which itis made a Such pulley may be made fast j i the bracket brings the axis of the roll int.

part. Flanges 41 and 42 on the sleeve emn brace the bracket 39 and hold the sleeve and gear 38 against endwise movement.

The work is fed to the upper side of the cutter by a feed roll 43 whichv rotates upon an axis transverse to the axis of the cutter and has aroughened convexed surface so formed that the feed roll may lie within the" circumference of the cutter and close to the edge thereof at all`points. In other wordl the longitudinal curvature of the roll is the same as the circular curvature of the clitter. The feed roll is mounted cuan arm or bracket 44 which has an offset portion l41', a tubular part 46 and lan end piece 47. The offset part is offset both verticall 1 as appears from Figs. 11 and 15. and orizontally as appears-from Fig. 13. The ends of the offset part support rotatablyashaft'48v to which the roll and a pinion 49 are secured.v The tubular portion 46 of the bracket contains a shaft 50 which carries on the end next to the feed roll, .a pinion 1meshwith the pinion 49,.and onl itsy opposite A Acarries a wormv wheel 52 whichv is driven by' a worm 53 on a shaft '54, said shaft supported. in bearings 55 and "561in the front. of the case and in the web 6,1% spectively, and having fixed upon it vl n f gear 57 which meshes with ya gear 58 n thecutter shaft 17. Gear 58 is' positively splined upon the cutter shaft so thatl a palb` tive. motion is given to 'the feed roll-- et l" speed which is much less than but propol's tional to the speed vof rotation of the cut-` ter. The driving transmission shaft 54 for the feed roll is at one side of the cutter, le appears from Figs. 2, 8, and 9, and so alle isnthe rock shaft 59 to which the bracket cavying the feed roll'is secured. The tubu ll lar part 46` of the bracket crosses the ythe knife and the offset part of the bracket is containedpartly in the space surrounded by the knife. The'xdescribed formation of lll the lplane of the cuttin edg'e of the which is an important eature of the invela-v i tion. Thereby the ysurface travel of the'mll" due to rotation thereof takes lace' in l die'` rection perpendicular to the` ine` in Ill the vcutting edge off'tlhe knife, travelscauses the materialwlich is acted the-'machine to be fedsquarely toward *e knife.- If the feed roll were mounted-f. rec'tly on the shaft 50 4which crosses the of the knife', and not on a shaft p i thereto,' the roll would either be locliedii: front of the knife edge2 or be required tatein a directionincllned in ajdirectidngba which it ispdesirableto feed, the work. f A lll cover lissecnredto. the bracket sowas M coverland protect the pinions l49rand Thiscover is shownin Figs. ,13.and 9,' but, omitted from the other' infwhich the feed roll is shownin deta'@ nThe l .The operative poi-tion of the on the aiin held up to the knife by a spring GQ' which presses against an arin (3f- (Fig. 1li detachably clamped on the rock shaft 50. and reacts against an adjustable abutment (ilV preterably formed as a tubular screw threaded through the vside wall 3 of the case and having a kiiurled head G53 by which it may be rotated. A rod 6G which is-engaged with the a'rin (33 passes through the tubular screw .(34. and carries on` its threaded outer end an adjusting nut 37. The screw lfd and nut (37 together determine the position o the teed roll and the tension with which the'latter holds the work up to the knife. The screw 64 regulates the compression ot the spring 62, while the nut G7 which abuts against the outer end ot the screw positively determinesI the locationl ot the roll. By so adjusting the roll the thickness ot the ski ving reinored from the work is adjusted and altered.

:An important feature ot the invention relates toa ghging means used in-connection with thett'eed roll and knife. Part of this gaging nieans consists of `a lip 08 which rises t'ron` the end member 4T ot-the roll holding bracket adjacent to one end of the feed roll. Another portion ot the gaging means is a guard plate (3S) fixed to thetop ot" the casing and extending therefrom in front of the edge of the knife as far as the opposite end of the feed roll from the lip GS. These gaging means limit the width of the skiving to the length of the roll. The depth and angle of the scart formed on,the skivededge of the piece are determined by a top gage 70 which overlies the upper, that is, the operative side ot the feed roll. This top gage issupported by an arin 71, which is fastened to a vertical slide. 72 set into a guideway in the front ot the, case and adapted to be raised and lowered by a screw 73 which is contained inthe slide and is threaded through a stud 71 fixed# to the casing and projecting into a slot 75 in the slide. A spring 76 bears against the stud 7-l and against the upper-end ot the slotand tends to raise the slide. The screw'has a knurled head 77 for maniial operation( lt will be readily understood that by rotating the scre\vin one direction or the other the slide may be raised or lowered, carrying the top j lfeed roll.,A

frage away t'roin or toward the top gage is kits under sui-tace which is curved on an arc substantially equal to the radius of the knife. The age has a wing 78 overlapping the arm 1, which latter is rigidly secured by lscrews 79 to the slide 72. The wing 7 8 has a slot S through which pass two sciewsl which are threaded intov the arin 71. The wing also carries a stud 83 having a transverse threaded aperture with which is engaged `a screw-Sli passing through a lug 85 71 and having a head 85 for manipulation. A

spring 87 surrounds they screw St and bears against the stud 83 and lug` S5. taking up backlash and holding thel `topgage in the exact position given it by and consequently such movements are swinging movements about the center of curvature of the slot. Such center of curvature. is the end or tip SS of the top gage, so that adjustments o'l the screw S-l have the el'ect merely of raising and lowering one end of the gage without altering the position of the other end. The gage as a whole, however, is raised and'lowered by the screw 7i By means of these two adjustments the skived edge of a piece of leather may be made to have any desired thickness and any desired angle of bevel. The gage lip (i8 of the roll-holding bracket extends past the end B8 the top` gage and-is approximately paralleltof rthe up and down movement thereof in all'positions ot' the roll. It is suiiiciently clbse' to the end of the top gage in all adjustments to prevent the edge of even a thin and flexible piece ot leather passing between the lip and top gage. Another portion of the gaging means which inav be used or not at williis an edge gage Si) haring a slotted base 9() which is adapted to be slipped' over the shank ot a screw J1 and, a stud 92 which project from the side oi" the roll-holding bracket. The stud 9L- is merely to guide the gage and prevent it trom rotating about the'screw 91. Said screw has a head which may be turned between the thumb and linger ot' the operator and clamps the edge gage in position. 'lliis gageiis adapted to be adjusted longitudinally of the roll and seiwes to limit the width ol' the skived edge ot the work when .such wiclli is designed to be less than the length of the roll. I

A stripper S) is provided on the rear side ot the bracket arm i5 close to the under surface otv the l'eed i'oll (see Fig. 5) to remove an)v bits or skiviiigs ot leather which may adhere to the roll a 'ter passing between the saine and the knife. YThe skivingsfall into the space surroundedfi` by the knife1 which is entirely open at the front end, and thence escape through the opening or recess in the hinged front wall 10, which is sub- Stantially iush with the edge of the knife seeve 96 termed on a swinging arm 97 pivoted to a bracket 0S fixed to the side wall 4 of the ease on the inside thereof. screw 9S? kis threaded through the side of the case turns the wliieel aray from the kniief when the. seri-w is withdrawn. Thegrinder driylng pulley is dri venhy :nbelt 101 which passes also around a pulley '102\which' is. .lruv'en 'lrietumally trom the gear\58 byu. disk-103 (see Fig. Jastened to the same sharl't with thevpulley k"10:2 and adapted to hear againstthe face ot' gear 58. f`- Preferably such gear has .an annular strip 10-t of l'rietional material Jfastened to its face arranged in position to he .engaged by the disk 10?. The shaft-of pulley 102 and disk 1025 is mounted in an'oseillating holder 105 which is .secured to-a rock shaft 10G having a bearing in a sleeve 107 which forms part of. a l'nacletsedured to the web 0. An arm 10S `is alsosecured to the rock shaft '106 and rises therefrom. being drawn toward the wcblby a spring 100. A cani 1.10 is arranged to acton the :ii-m10?? and is'carried byA a stud 111 which passes through the side wall of the case and is fixed to an operating lever 112. The cam may be brought to bear on the arm 108, thereby swinging the same outwardly and turning the rook shaft 106 and holder 105 so as to remove'the disk 103 from Contact with the gear 58. 'When the cam is' withdrawn, the spring 109 pulls arm 108 so as to bringthe disk 103 into contact with the gea;` 58. In this way the grinder may be dritten when necessary to sharpen the knife, and not operated at any other time.

From the foregoing detailed description of construction and arrangement of the parts, it will be understood that when the machine vis set in motion by coupling pnl ley 27 to shaft 28, the cylindrical knife is put in rotation and the feed roll is simultaneously also in rotation in .the direction wherein its upper surface travels toward and under the adjacent part of the knife edge. In so traveling the motion of the feed roll surface is perpendicularly toward the knife. A Thereby'a piece .of leather laid 'upon the roll isfed squarely against ,the knife edge. The roli is adjusted ffor the thickness of the leather' and also for thatof the skiving to be lremoved by the nut 67, while the pressure awvith which Yit resists downward yielding `as the leather is forced.` under the top gage. is determined by adjustments of the screw abutment 64 of spring 62. The width of the stock acted uponby the' knife is determined by the adjustable gage 89 or when the greatest possible width of scart is desired the gage 89 is removed and the width determined by the lip 68, which Aalso prevents the scarf from being eut baek from he edge of the piece.v The depth of the ciuJ is then regulated by the' vertical adjustment of the ,f lfagniA and the anfle of. the scarf so' produced is determined by the angular adjustment of said top gage. The adjustments ot tlf' gage may be made to produce a scart' of any desiredbevel from an abrupt hevelto one .which lisfpracticallyL vparallel Atothe surface of the leather, and the skived edge may ibd leftA to any-desired .thi 'kness by the vertical adjustment of the gage.. The top .frage -with all` of itsl adjust f ments may be used in conjunction with the edge gage 80, or with the' lip 68, when the gage e0 is removed. W'hen the knife `needs sharpenmgit can be sharpened at any time by simply screwing in the screw 99 and at the same time throwing over the. lever 112. When the' grinder is not requiredit'may be moved out of operative position and also stopped from rotating. Ample opportunity is provided for adjusting. the knife by means of the nut as fast as its substance is removed by grinding the edge, so that no matter how much of the stock of thejlmife may be ground off, its edge may still a1- ways remain over the axis of the ,feedv roll and in substantially the'same plane therewith. It will he. noted from Fig. 5 that the knife becomes useless when its edge is at a distance from the back platel 14. materially less than the radius of the feed roll.. The

provision for adjustment is substantially ,l

greatenough to permit advance of the f I am thereby enabled to `ser` eure results which accord exactly with pre- 'determined designs and are more accurate .and of better appearance than," can be obtained by machines. previously use d. l'

What I claim and desire to secure by Letters Patent is:

1. A skiving machine comprising in combination, a knife, a feed roll arranged in proximity to knife,.a normally stationyary gagearrangedoppositelyto said feed roll, .means for adjusting said gage toward .and from the feed'roll, and means for 1d-4 yms l justing the gage angularly about' a point )y ly'ing in theoperatiye portionof the gage and adjacent to one thereof. v.

Q. Askiving machine comprising a cylin- `drica'll. knife having an edge at one end. a normally stationary gage mounted nearsa-id edge and having its sui-tace adjacent to the edge approximately concentric therewith. a4

yuns

slide on which said vgage vis mounted mov.-

-able in la plane perpendicular-Ato the axis of the knife, and

y slide for movement angularly about a point approximately in'its operative edge'.

3. A gaging means for a skiving machine comprisinga normally stationary top gage,

' adjusting means for adjustingsaid top gageangularly about point approximately inits .operative surface, and means for'adjustingthe said gage bodily in a direction transverse to its opera-tive surface. i

et. Ina skiving machine, the combinationv with a rotary cutting knife and `means for feeding material toward such knife, of a top gage arranged over said feeding means. and across the line in Which the Work is fed, a gaging stop 4adjacent. to one end 'of said 'feeding means extending toward andacross an adjacent end f the toplgage, means fof said top gage in directions approximately parallel to the gaging stop, and means for adjusting the top gageangularly about a center approximately at the point Where said Ytop. gage and gaging stop meet. y

5. In a skiving machine, the combination of a skivinglknife, a feed roll at one side of the edge of said knife and a gage overlying said feed 'roll at the opposite side of the edge of said knife, an edge stop extending froml the end of the feed roll across the adjacent end of the gage, a support for the gage, and

means for attaching said gage to said' sup-v port constructed to permit movement of the gage about an axis substantially coincident',A with the end of the gage next to the edge Sto d.) In a skiving machine, the combination with' a cylindrical knife, of'a feedroll 1ocated adjacent to the edge of said knife and having its surface longitudinally .curved eonformably to the adjacent part o V'the knife edge, an edge stop extending from one. end of said roll across the adjacent partof the knife edgey a top gage overlying said roll havin one end substantially in contactA` yof the roll.'

with saidejtop, anda guard lying in .front of the/knife` edgeadja'cent to the opposite end of the. roll, whereby the operative extent of the knife edge is limited to the length av skiving knife,

7. In a skiving machine,

the edge of the a feed roll bracket crossing knife, a feed roll mounted inv said bracket and'held thereby y n with its surface Aclose to4 the edge of the knife 'at one side thereof and itsaxis approximately1 infthe same 'plangwith the acting point of such edge, an edge gage'kfixed on said bracket atone end of the rolllaftl projecting across .the knife edge, a, top4 gage on the opposite ,side of the knife edge from the feed' roll and exten'ding from ai point in the operative surface ofthe edge tween said roll and top gage,

gage approximately" parallel with the adjacent surface of the roll, and a holder to Which said top gage4 is clamped in a nor Inally stationary position with capability of adjustment angularly about the end thereof which is nearest said edge gage.

8. In a skivingmachine, the `combination of afed roll, a yieldingly mounted holder .for said roll, a..top gage extending longitudinally o f said feed roll, and an edge gage extending transversely of said feed roll in intermeshing spiral gears mounted upon said driving shaft and vknife shaft respectively,

thegear which is on the knife shaft bein-g splined heretov so as to permit relative end- Wise movement ofthe'shaft,.and a holder I for preventing said gear from having such movement. g

10. A skiving machine comprisinga cylindrical knife,i a shaft on which said knife' is carried and by which itis rotated, al gear mounted upon'and dri-ven'by said shaft, a second shaft, a ,gear secured thereto and meshing with the firstl gear, a feed'roll -havin its .axis transverse ,to the axis of the knife andlocated clo'seto a part of the edge thereof, `Vand worm' and .Wheel gearing through which said second shaft l"drivesthe 11. In'a skiving machine the combination With`a-sharp edged cutting knife and a feed roll` mounted wlth its surface close to Vthe edge of said' knife and traveling toward'such edge, of la Atop gagelocated near the 'edge of the knife, said roll being over said roll arranged to yield away from said gage, and

an edge gage arranged to cross the space'beand so connectedwith the roll as to move with the latter. toward and away from-the top gage.

12. 'In a skiving machine, a Work supporting member yieldingly mounted near the edge of said knife, a top gage extending :over said supporting meme ber, an edge stop extending from one end of said supporting member across one vend of said top gage and being in substantially the same plane therewith, and means for adjusting vt end thereof which is nearest to said end sto l'n a skiving machine, a work supporting member a cuttingl knife, yieldingly acutting knife, l.

e top gage angularly about the mounted near the edge of said knife, a top gage extending over said supporting member, an edge stop extending from one end of said supporting member across one end of said top gage and being in substantially the same plane therewith, means for adjusting the top gage angularly about the end thereof which is nearest to said end stop,

and' means for adjusting said top gage bodily toward and away from said supporting member in a direction substantially parallel to said stop.

le. A Work guiding means for a skiving machine, comprisin 1n combination a feed roll, a holder for said feed roll, an edge stop connected to said holder close to an end of said roll and extending beyond the periphery of the roll at such end, a top gage having one end in substantial contact with said `edge stop, and an edge gage mounted detachably and adjustable on said roll `holder and extending into close proximity to the top gage and to the adjacent surface of the roll and across the space between said top gage and said surface.

15. In a sliving machine, a feed roll, a'

top gage vextending longitudinally of the roll close to the operative surface thereof, means for adjusting said top gage angularly about one end thereof in a plane approximat'ely radialto the roll, and a gaging stop in such elosevproximity to the ivot end of the top gage and the correspon ingends v ,of the roll as to be substantially about one end .thereof in a plane approximately radial tothe roll, and a gaging vstop in such close proximity to the pivot end of the top gage and the corresponding ends of the roll as to be substantially in contact therewith, said roll being independently mounted and arranged'to'` be separable from the top gage against yielding resistance, and

the said stoprbeing car'ried With the roll in its motementstoward and away from the top gage, if:

In testimony whereof I' havev affixed my signature, in presence of two witnesses.'

. HAROLD A. BROWN.

Witnesses:

WILLIAM J. CALLAHAN, JAMES H. DUNPHY. 

